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[ Identification | Description | Input parameters | Output parameters | Links ]
The Guide_honeycomb Component
Neutron guide with gravity and honeycomb geometry. Can be channeled and focusing.
Identification
- Author: G. Venturi
- Origin: ILL (France).
- Date: Aug 03 2001
- Version: 1.8
- Modification history:
- E. Farhi, from Honeycomb_guide by K. Lefmann (buggy).
- E. Farhi, focusing channels are now ok (Sept 4th, 2001).
- E. Farhi, 2D channel array. Correct focus bug (Dec 14th 2002)
- G. Venturi, Made Honeycomb from Guide_gravity (Apr 2003)
- E. Farhi, corrected gravitation bug (Feb 2005)
Description
Models a honeycomb guide tube centered on the Z axis. The entrance lies
in the X-Y plane. Gravitation applies also when reaching the guide input
window. The guide can be channeled (hexagonal channel section; k,d parameters).
The guide coating specifications may be entered via different ways (global,
or for each wall m-value).
For details on the geometry calculation see the description in the McStas
reference manual.
Example: Guide_honeycomb(w1=0.1, w2=0.1, l=12,
R0=0.99, Qc=0.0219, alpha=6.07, m=1.0, W=0.003, k=1, d=0.0005)
Example values: m=4 Qc=0.02 W=1/300 alpha=6.49 R0=1
WARNING: This is a contributed Component.
Input parameters
Parameters in boldface are required; the others are optional.| Name | Unit | Description | Default |
|---|---|---|---|
| w1 | m | Width at the guide entry | |
| w2 | m | Width at the guide exit | |
| l | m | length of guide | |
| R0 | 1 | Low-angle reflectivity | 0.99 |
| Qc | AA-1 | Critical scattering vector | 0.0219 |
| alpha | AA | Slope of reflectivity | 6.07 |
| m | 1 | m-value of material. Zero means completely absorbing. | 1.0 |
| W | AA-1 | Width of supermirror cut-off | 0.003 |
| k | k-1 vertical dividing walls | [1] Number of horizontal channels in the guide (>= 1) [1] | 1 |
| d | m | Thicxkness of subdividing walls [0] | 0.0005 |
| mleftup | 1 | m-value of material for leftup. oblique mirror | -1 |
| mrightup | 1 | m-value of material for rightdown. oblique mirror | -1 |
| mleftdown | 1 | m-value of material for rightdown. oblique mirror | -1 |
| mrightdown | 1 | m-value of material for leftup. oblique mirror | -1 |
| mleft | 1 | m-value of material for left. vertical mirror | -1 |
| mright | 1 | m-value of material for right. vertical mirror | -1 |
| G | m/s2 | Gravitation norm. 0 value disables G effects. | 0 |
Output parameters
| Name | Unit | Description | Default |
|---|---|---|---|
| GVars | - | .N_reflection: (1) Array of the cumulated Number of reflections N_reflection[0] total nb of reflections N_reflection[1,2,3,4.5.6] reflections N_reflection[7] total nb neutrons exiting guide N_reflection[8] total nb neutrons entering guide |
Links
- Source code for
Guide_honeycomb.comp.
[ Identification | Description | Input parameters | Output parameters | Links ]
Generated automatically by McDoc, Peter Willendrup <peter.willendrup@risoe.dk> / Fri May 11 08:41:09 2012
